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panel: Stop using Shell.GenericContainer

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Shell.GenericContainer exposes the size negotiation machinery
through the use of signals. Signals are not specially performant.
One of the reasons is that they acquire a global lock for signal
handlers lookup. GNOME Shell has more than 2,000 actors at any
given point in time, up to 20 levels deep in hierarchy, making
size negotiation and painting non-trivial tasks. Such a critical
section of Clutter's machinery shouldn't rely on signals
whatsoever.

Regardless of that, Shell.GenericContainer is a workaround to
a non-existing issue anymore. It shouldn't be used anyway, and
any performance improvements that removing it can potentially
yield are bonuses to it.

This commit starts this work by removing Shell.GenericContainer
usage from Panel.Panel class. The class now extends St.Widget,
and as such, it has no "this.actor" field set anymore. A couple
of places where this actor field was used are adjuste as well.

It is important to notice that we now allocate the Panel itself
inside vfunc_allocate(). This was previously done before emitting
the signal by Shell.GenericContainer.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/153
This commit is contained in:
Georges Basile Stavracas Neto 2018-06-27 16:02:15 -03:00
parent a3f5354abb
commit 286ffbe2b6
No known key found for this signature in database
GPG Key ID: 886C17EE170D1385
3 changed files with 39 additions and 44 deletions
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2
js/ui/overview.js
View File

@ -226,7 +226,7 @@ var Overview = new Lang.Class({
// Add a clone of the panel to the overview so spacing and such is
// automatic
this._panelGhost = new St.Bin({ child: new Clutter.Clone({ source: Main.panel.actor }),
this._panelGhost = new St.Bin({ child: new Clutter.Clone({ source: Main.panel }),
reactive: false,
opacity: 0 });
this._overview.add_actor(this._panelGhost);

75
js/ui/panel.js
View File

@ -774,12 +774,16 @@ const PANEL_ITEM_IMPLEMENTATIONS = {
var Panel = new Lang.Class({
Name: 'Panel',
Extends: St.Widget,
_init() {
this.actor = new Shell.GenericContainer({ name: 'panel',
this.parent({ name: 'panel',
reactive: true });
this.actor._delegate = this;
this.actor.set_offscreen_redirect(Clutter.OffscreenRedirect.ALWAYS);
// For compatibility with extensions that still use the
// this.actor field
this.actor = this;
this.set_offscreen_redirect(Clutter.OffscreenRedirect.ALWAYS);
this._sessionStyle = null;
@ -788,36 +792,33 @@ var Panel = new Lang.Class({
this.menuManager = new PopupMenu.PopupMenuManager(this);
this._leftBox = new St.BoxLayout({ name: 'panelLeft' });
this.actor.add_actor(this._leftBox);
this.add_child(this._leftBox);
this._centerBox = new St.BoxLayout({ name: 'panelCenter' });
this.actor.add_actor(this._centerBox);
this.add_child(this._centerBox);
this._rightBox = new St.BoxLayout({ name: 'panelRight' });
this.actor.add_actor(this._rightBox);
this.add_child(this._rightBox);
this._leftCorner = new PanelCorner(St.Side.LEFT);
this.actor.add_actor(this._leftCorner.actor);
this.add_child(this._leftCorner.actor);
this._rightCorner = new PanelCorner(St.Side.RIGHT);
this.actor.add_actor(this._rightCorner.actor);
this.add_child(this._rightCorner.actor);
this.actor.connect('get-preferred-width', this._getPreferredWidth.bind(this));
this.actor.connect('get-preferred-height', this._getPreferredHeight.bind(this));
this.actor.connect('allocate', this._allocate.bind(this));
this.actor.connect('button-press-event', this._onButtonPress.bind(this));
this.actor.connect('touch-event', this._onButtonPress.bind(this));
this.actor.connect('key-press-event', this._onKeyPress.bind(this));
this.connect('button-press-event', this._onButtonPress.bind(this));
this.connect('touch-event', this._onButtonPress.bind(this));
this.connect('key-press-event', this._onKeyPress.bind(this));
Main.overview.connect('showing', () => {
this.actor.add_style_pseudo_class('overview');
this.add_style_pseudo_class('overview');
this._updateSolidStyle();
});
Main.overview.connect('hiding', () => {
this.actor.remove_style_pseudo_class('overview');
this.remove_style_pseudo_class('overview');
this._updateSolidStyle();
});
Main.layoutManager.panelBox.add(this.actor);
Main.ctrlAltTabManager.addGroup(this.actor, _("Top Bar"), 'focus-top-bar-symbolic',
Main.layoutManager.panelBox.add(this);
Main.ctrlAltTabManager.addGroup(this, _("Top Bar"), 'focus-top-bar-symbolic',
{ sortGroup: CtrlAltTab.SortGroup.TOP });
Main.sessionMode.connect('updated', this._updatePanel.bind(this));
@ -827,7 +828,7 @@ var Panel = new Lang.Class({
global.window_group.connect('actor-removed', this._onWindowActorRemoved.bind(this));
global.window_manager.connect('switch-workspace', this._updateSolidStyle.bind(this));
global.display.connect('workareas-changed', () => { this.actor.queue_relayout(); });
global.display.connect('workareas-changed', () => { this.queue_relayout(); });
this._updatePanel();
},
@ -847,24 +848,18 @@ var Panel = new Lang.Class({
this._updateSolidStyle();
},
_getPreferredWidth(actor, forHeight, alloc) {
vfunc_get_preferred_width(actor, forHeight) {
let primaryMonitor = Main.layoutManager.primaryMonitor;
alloc.min_size = -1;
if (primaryMonitor)
alloc.natural_size = primaryMonitor.width;
else
alloc.natural_size = -1;
return [0, primaryMonitor.width];
return [0, 0];
},
_getPreferredHeight(actor, forWidth, alloc) {
// We don't need to implement this; it's forced by the CSS
alloc.min_size = -1;
alloc.natural_size = -1;
},
vfunc_allocate(box, flags) {
this.parent(box, flags);
_allocate(actor, box, flags) {
let allocWidth = box.x2 - box.x1;
let allocHeight = box.y2 - box.y1;
@ -876,7 +871,7 @@ var Panel = new Lang.Class({
centerWidth = centerNaturalWidth;
// get workspace area and center date entry relative to it
let monitor = Main.layoutManager.findMonitorForActor(actor);
let monitor = Main.layoutManager.findMonitorForActor(this);
let centerOffset = 0;
if (monitor) {
let workArea = Main.layoutManager.getWorkAreaForMonitor(monitor.index);
@ -889,7 +884,7 @@ var Panel = new Lang.Class({
childBox.y1 = 0;
childBox.y2 = allocHeight;
if (this.actor.get_text_direction() == Clutter.TextDirection.RTL) {
if (this.get_text_direction() == Clutter.TextDirection.RTL) {
childBox.x1 = Math.max(allocWidth - Math.min(Math.floor(sideWidth),
leftNaturalWidth),
0);
@ -909,7 +904,7 @@ var Panel = new Lang.Class({
childBox.y1 = 0;
childBox.y2 = allocHeight;
if (this.actor.get_text_direction() == Clutter.TextDirection.RTL) {
if (this.get_text_direction() == Clutter.TextDirection.RTL) {
childBox.x1 = 0;
childBox.x2 = Math.min(Math.floor(sideWidth),
rightNaturalWidth);
@ -1069,7 +1064,7 @@ var Panel = new Lang.Class({
if (this._sessionStyle)
this._addStyleClassName(this._sessionStyle);
if (this.actor.get_text_direction() == Clutter.TextDirection.RTL) {
if (this.get_text_direction() == Clutter.TextDirection.RTL) {
this._leftCorner.setStyleParent(this._rightBox);
this._rightCorner.setStyleParent(this._leftBox);
} else {
@ -1079,7 +1074,7 @@ var Panel = new Lang.Class({
},
_updateSolidStyle() {
if (this.actor.has_style_pseudo_class('overview') || !Main.sessionMode.hasWindows) {
if (this.has_style_pseudo_class('overview') || !Main.sessionMode.hasWindows) {
this._removeStyleClassName('solid');
return;
}
@ -1097,8 +1092,8 @@ var Panel = new Lang.Class({
});
/* Check if at least one window is near enough to the panel */
let [, panelTop] = this.actor.get_transformed_position();
let panelBottom = panelTop + this.actor.get_height();
let [, panelTop] = this.get_transformed_position();
let panelBottom = panelTop + this.get_height();
let scale = St.ThemeContext.get_for_stage(global.stage).scale_factor;
let isNearEnough = windows.some(metaWindow => {
let verticalPosition = metaWindow.get_frame_rect().y;
@ -1190,13 +1185,13 @@ var Panel = new Lang.Class({
},
_addStyleClassName(className) {
this.actor.add_style_class_name(className);
this.add_style_class_name(className);
this._rightCorner.actor.add_style_class_name(className);
this._leftCorner.actor.add_style_class_name(className);
},
_removeStyleClassName(className) {
this.actor.remove_style_class_name(className);
this.remove_style_class_name(className);
this._rightCorner.actor.remove_style_class_name(className);
this._leftCorner.actor.remove_style_class_name(className);
},

4
js/ui/windowManager.js
View File

@ -1796,11 +1796,11 @@ var WindowManager = new Lang.Class({
if (direction == Meta.MotionDirection.UP ||
direction == Meta.MotionDirection.UP_LEFT ||
direction == Meta.MotionDirection.UP_RIGHT)
yDest = -global.screen_height + Main.panel.actor.height;
yDest = -global.screen_height + Main.panel.height;
else if (direction == Meta.MotionDirection.DOWN ||
direction == Meta.MotionDirection.DOWN_LEFT ||
direction == Meta.MotionDirection.DOWN_RIGHT)
yDest = global.screen_height - Main.panel.actor.height;
yDest = global.screen_height - Main.panel.height;
if (direction == Meta.MotionDirection.LEFT ||
direction == Meta.MotionDirection.UP_LEFT ||